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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Mar. 31, 2022
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 126,340 $ 120,499
Less than 12 months, Unrealized Losses (10,530) (9,798)
12 months or longer, Estimated Fair Value 82,117 35,740
12 months or longer, Unrealized Losses (19,034) (3,351)
Total, Estimated Fair Value 208,457 156,239
Total, Unrealized Losses (29,564) (13,149)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 116,487 192,642
Less than 12 months, unrealized losses (17,094) (12,552)
12 months or longer, Estimated Fair Value 95,002 40,417
12 months or longer, Unrealized Losses (22,431) (4,519)
Total Estimated fair value 211,489 233,059
Total, Unrealized Losses (39,525) (17,071)
Municipal securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 18,343 32,767
Less than 12 months, Unrealized Losses (4,024) (4,293)
12 months or longer, Estimated Fair Value 18,397 3,282
12 months or longer, Unrealized Losses (6,017) (221)
Total, Estimated Fair Value 36,740 36,049
Total, Unrealized Losses (10,041) (4,514)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 2,594 5,911
Less than 12 months, unrealized losses (1,098) (816)
12 months or longer, Estimated Fair Value 4,425 3,036
12 months or longer, Unrealized Losses (2,239) (606)
Total Estimated fair value 7,019 8,947
Total, Unrealized Losses (3,337) (1,422)
Agency securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 56,425 22,288
Less than 12 months, Unrealized Losses (2,326) (1,565)
12 months or longer, Estimated Fair Value 27,801 16,414
12 months or longer, Unrealized Losses (5,079) (1,579)
Total, Estimated Fair Value 84,226 38,702
Total, Unrealized Losses (7,405) (3,144)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 36,346 35,930
Less than 12 months, unrealized losses (3,695) (1,708)
12 months or longer, Estimated Fair Value 11,371 6,897
12 months or longer, Unrealized Losses (2,439) (742)
Total Estimated fair value 47,717 42,827
Total, Unrealized Losses (6,134) (2,450)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 8,081 17,334
Less than 12 months, Unrealized Losses (866) (1,310)
12 months or longer, Estimated Fair Value 21,862 15,275
12 months or longer, Unrealized Losses (4,946) (1,537)
Total, Estimated Fair Value 29,943 32,609
Total, Unrealized Losses (5,812) (2,847)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 13,769 26,233
Less than 12 months, unrealized losses (1,492) (1,715)
12 months or longer, Estimated Fair Value 17,798 7,735
12 months or longer, Unrealized Losses (3,804) (742)
Total Estimated fair value 31,567 33,968
Total, Unrealized Losses (5,296) (2,457)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 14,644 15,702
Less than 12 months, Unrealized Losses (1,186) (436)
12 months or longer, Estimated Fair Value 2,159  
12 months or longer, Unrealized Losses (265)  
Total, Estimated Fair Value 16,803 15,702
Total, Unrealized Losses (1,451) (436)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 56,478 111,096
Less than 12 months, unrealized losses (9,647) (7,160)
12 months or longer, Estimated Fair Value 51,853 17,363
12 months or longer, Unrealized Losses (11,294) (1,723)
Total Estimated fair value 108,331 128,459
Total, Unrealized Losses (20,941) (8,883)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 28,847 32,408
Less than 12 months, Unrealized Losses (2,128) (2,194)
12 months or longer, Estimated Fair Value 11,898 769
12 months or longer, Unrealized Losses (2,727) (14)
Total, Estimated Fair Value 40,745 33,177
Total, Unrealized Losses (4,855) (2,208)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 7,300 13,472
Less than 12 months, unrealized losses (1,162) (1,153)
12 months or longer, Estimated Fair Value 9,555 5,386
12 months or longer, Unrealized Losses (2,655) (706)
Total Estimated fair value 16,855 18,858
Total, Unrealized Losses $ (3,817) $ (1,859)